Belt



ug- 29, 1933- A. L, FREEDLANDER 1,924,354

' BELT Filed April 16, 1931 2 Sheets-Sheet 1 ZXNZMW 11g- 29, 1933- A. l.. FREEDLANDER 1,924,354

BELT

Filed April 16, 1931 2 Sheets-Sheet 2 '45 strength in the compression and tension sec- Patented u'vg. 29, 1933 Y UNITED STATES PATENT OFFICE BELT Abraham L. Freedlander, Dayton, Ohio `Application April 16, 1931. Serial No. 530,537 Wx w1 la;

4 Claims. l(Cl. 7463) My invention relates to belts. Figure 3 is a section on the line 3 3 of Fig- It is the object of my invention to provide urel; i a very rigid belt, which is rigid against trans- Figure 4 is a section on the line 4 4 of Figverse and longitudinal compression'and extenure 3;

, 5 sion but in which the backbone oi` neutral axis Figure 5 is a section on the-line 5-5 of Fig- 60 of the belt lies in the single layer of cords of very ure 3; t large section which are'maintained in parallel Figure 6 is a section on the line 6-6 of Figalignment and are Wound upon the belt. ure 3; t

It is also within the scope of my invention to Figure 'l is` an elevation of the belt material wind the cord layer spirally on the belt, but wound on a drum showing the lines of severance 65 either the Winding of the cord fabric or the inof the belt material into individual belts, a pordependent cord may be employed. tion of the belt material being broken away and It is my object to provide a belt with a straight shown in section; laid wrapper, that is, a Wrapper in which the Figure 8 is a top plan view of a straight laid axis of one part of the threads is parallel to the l Wrapper belt employing the construction of this 70 longitudinal axis of the belt and the other invention; threads at right angles thereto. Figure 9 is a side elevation thereof;

It is a further object to provide such a Wrapped Figure 10 iS a SeCtiQn -011 the line 1 0-10 0f belt using straight laid fabric not only in the Figure 8; Y

wrapper but also in the beit itself that'wiu be Figure 11 is a section onthe line 11-11\of Fig- 75 fully exible will not buckle and will give all the ure 103 advantages of a bias-1am fabric but withA a. Figure 12 is a section 0n the line 12--12 0f `Fiecheaper and more easily handledstraight laid ure 10; l fabric particularly as a Wrapper. Figure 13 is a section on the line 13-13 of Fig- It is my object to provide low temperature ure 10; 80 vuicanization below the critical temperature of Referring to the drawings in detail, the belt the fabric composing the ben;- to prevent burning is composed of a section which may be used either of the fabric or deterioration thereof and to comas a COmDreSSOn 0r tens/i011 SeCtiOn formed 0f rubbine with such fabric a non-revertible rubber biir andne ber, aS at 1, althOllgh rubber alOne containing a very fast acceleration with a very may be employe@ I use non-revltble rubber 10W percentage of Suipnun secured by the employment of a very fast ac I am thus enabled to get a rubber which, um celeration in combination with a very low perder heat, does not revert` to a sticky condition, Centage 0f Sulphur, that is abQut three pement a rubber in which a low temperature of vulcaniby Welght of Sulphur t0 the Welght 0fl'ubbel'- I 90 zation is possible so that the fabric is not inmployacure of aplroximately 2,60 degreeswhich jured during Vulcanization, ,and a belt, which is well below the critical .temperature of the fabbecause of its low modulus, non-revertible charnc both m the belt and m the rubber I employ acteristics, will permit of theuse of a straight the same type of Timber for lmpregna'tmg the 40 laid Wrapper or straight laid material composing Wrapper t 95v a part of the belt. Wound either as a singlecord or as a plurality It is a further object to provide a belt in which of cords held together in alignment, I provide the the ve lai' e cords constitutin the ne com elements 2 Which.a're composed of a' plu' make posgsible to provide suncient zlmal vrality of strands 3 forming relatively large heavy independent cord members that are wound spiral- 1 tions that such sections may be used interchange- 1y: pgfrll grggecglsr gncg'l ggg? Ingf ablygether by the threads 4,.then the fabric will be It 1S a further ObJeCt t9 PrOVlde @belt 111 Whlch laid on the rubber i with the cords 2 substantithe wrapper .charecterlstls deseribed may be any paraiiei to the axis of the belt and paraiiei formed of cords arranged transversely of the lonto one aothen Thus, I form a beit composed of gitudlnal' aXlS 0f the bem a plurality of homogeneous independent cord Referrmg t0 the draWmgS members. I thus secure sufficient strength trans- Figure 1 iS a tOD Plan View` 0f the belt em- .versely and longitudinally butavoid-the buckling ploying a cord wrapper; incident to having a, plurality of layers of cords no' Figure 2 is a side elevation thereof; arranged longitudinally of the belt.

A layer of rubber 5 covers these cords and is interspersed between them to form a resilient bed and friction absorbing medium for these'large 1 cords. I' then lay two layers of transversely arcentrally of the belt. It does not makeany dif- ,the supporting Aference whether the structural members 6, 'I and 8 are aboveor below the neutral axis layer of cords 2. The rubber having the fiber-as at 1 is of the same resiliency substantially as the section composed of the layers 6, 7 and 8.

'Ihis material heretofore described is laid upon drum or mandrel 9. Due to the fact that the neutral axis 2 is equidistant from the top andbottom, I am enabled to 4cut the belt material into-trapezoid sections as indicated in, Figure 'I without waste of materiah The extreme iiexibility of the material makes it possible to vutilize the belts no-matter whether the section 1 is'the compression or tension section, although I-prefer to use the belt in the form shown in Figure 3,for instance.

After the belts have been cut, I provide a wrap- 'per of cords 10-10 arranged transversely to the longitudinal axis of the belt, which cords are impregnated witha rubber skim' of the same type of very soft, non-'revertible, low modulus rubber heretofore referred to.'

The cords so arranged permitof easy flexing of the belt as it passes over short center drives of small pulleys, While, at the same time, due to the cord structure, long life is given to the belt and sufficient transverse rigidity.

It is a further -advantage in that the cords provide large heat radiating members which transy mit heat from the internal cord and fabric construction heretofore `referred to. This heat is generated during operation in the usual manner and must be removed from the belt as rapidly asvpossible and effectively as possible in order to increase the vlife of the belt.

I also provide, as shown in Figures 8 to 13, a belt with a' wrapper of straight laidv fabric impregnated with rubber,'in which a part of the cords run parallel to the longitudinal axis and a part of the. cords run at right angles thereto.

This form of .wrapper is cheaper and more easily handled than bias-laid fabric and will be .my combination, of a very I claim as new and desire fully flexible without buckling when used with flexible neutral axis, section so far as transverse inextensible.

bending is concerned. t but llaterally incompressible and longitudinally By use of the Alow modulus non-revertible rubber, I secure a very soft and flexible belt which permits of the use of these wrappers which hitherto have been unsuccessful. It will be understood that I desire to comprehend within my invention such modifications as may be necessary to adapt it to varying conditions and uses. Having thus fully described my invention, what to secure by Letters Patent; is:

1. In combination, a beltcomprising a rubber compression section, a neutral axis section composed of a. relatively large wound cordarranged in a vsingle layer on theco'mpression section, a layer of transverse Acords on the neutral axis, and

- a layer of straight vlaid fabric on the transverse cords. 2. In combination', a belt comprising a rubber compression' section, a neutral axis section'composed of a relatively large wound cord arranged in a single layer on the compression section, a layer of transverse `cords on the neutral axis, a layer of lstraight laid fabric on the transverse cords, and'a wrapper for said belt comprising cords-arranged transversely of the longitudinal axis of thebelt, said-cords lbeing impregnated `with rubber.

3. -In combination, a belt comprising a rubber compression section, a neutral axis section composed of a relatively large wound cord arranged in a singlev layer y on the compression section, a layer of transverse cords on the neutral axis, a layer of'straight laid fabric-on the transverse cords, and a wrapper for said belt comprising straight laid fabric impregnated with rubber.

4. In combination in abelt of a compression section composed of fibers and rubber, a single cord wound thereon of relatively large section comprising a rality of superimposed, transversely arranged plurality of woven strands, a vplucord layers on the wound cord, a rubber impregnated layer of straight layers, and a wrapper -for the belt of rubberin'ipregnated cords arranged transversely ofthe longitudinal axis of the belt.

ARAHAM L. FBEEDLANDER.

laid fabric on the cord 

